AT&T promised that it would be expanding its HSPA+ rollout this year, and it's now finally touting some actual results. Speaking at the Sencha Conference in San Francisco this week, AT&T CTO John Donovan confirmed that the carrier has upgraded a full 80 percent of its network to HSPA+, which promises to offer two and half times the performance of regular HSPA. Donovan also talked a bit out mobile data use in general, and revealed that data traffic growth has actually slowed over the past few months from a rate of 50 times to 30 times what it was three years ago. Donvon was quick to point out, however, that "If you look in absolute numbers, it's still a tremendous growth rate," and actually represents a three thousand percent uptick in data traffic over the past three years.